pettibone



To ALL WHoM IT MAY coNoERN= BENJAMIN GARVIN AND R. J. PETTIBONE.. 0F OSHKOjSHfWISCONSIN. y Letters .Patent'Na 62022, @lateral February 12, 1867.

IMPROVEMENT InV TUBUL'AR ena'rrs.'

Be it known that we, BENJAMINGARVIN and R. J. PETTIONE, of Oshkosh, in -the county of Winneba-gq'and State of Wisconsin, have invented a nepr and useful Improvement in Tubular-"Grates for Fire-Boxes; andpwe do hereby' declare that the' following is a full, clear, and exact descriptionof the construction and operation'of the same, reference being had to the annexed drawings and letters of reference inarked thereon,making a part of this specification, .in which- -I Figure 1 is an end view of the grate,ishovving the manner of connecting the tubes.

4 l Figure 2 is a plauview of the under side of the grate.

Figure 3 isi-'a transverse section of the grate, taken througlrred line a: x,`g. 2.

The nature of our-invention consists in connecting the `two alternate ends of the tubes together 'by Ineans of tubular caps, so arranged that the expansion of the grates rwill not be so great as tn cause breakage, as `is now the case whenl the grates are firmly secured together by clamps or rods. A material object is gained by mea-ns of our device for continuing the current of Water through the tubular grate-bars, freni the fact that the tubes vcan be vdivided-in pairs, and adjusted tol suit the capacity of any ordinary {ire-box, by simply connecting the requisite number of` tubular grates, bymeans of the'caps, to fill the space desired, either at the top, bottom, or sides ol the fire-box.v By this arrangement, our device can be readilyapplied tothe fire-boxes of locomotives, and any kind of stationary engines. And we claim, further, that the objectionher'etofone found in the use oftubular grates is obviated, because the liability of breakage is removed, and the full'benefit of water passing through heated grates is retained. It is a well-known fact that the heat of the comlonre-box is,`in a great measure,

lost,K from the fact that the grate imparts no`dire9t heat to the water in theboiler; and that, no matter how l large the surface, the blaze, passing through-the boiler fines, has to be'brelieid upon for heating the water in the boiler. We claim that, by the use of our tubular grate, alarga portiou'iof the' fuel novv iused for producing steam may be dispensed `sith, for, the waterpassing through the tubular grate, may be heated, and ente;` the boiler in ,such a state as to prevent-'the possibility of an explosion from too great a ovv of water (which is cold) into the boiler, icreating a vacuum, which frequently causes the boiler to collapse.` A

To enable others skilled in the' art to 'make and use 'our invention, v verwill describe its construction and operation. v i

A represents a seriesvoftubes, connected together by Imeans of our connectingcaps B. shows one ofthe tubes broken away, i'n order to 'give a view of the water-passage. l) are the bolts, and Ethe nuts which are used to clamp the caps B firmly to the ends Aof' the tubes A. `J,.figs. 2 and 3,l show rabbcts madeinrthc face of the caps B, audcthe tongues which t intocountersinks vmade vin the enlarged ends ofthe tubes A, for Athe purpose ofi making thejoints steam-tight, VWithout the use of packing. F and'll show pipes attached to the opposite extreme ends of' the tubes A, by means 'of the short pipes jH, made fast by the screw-jointsl, as seen at iig.` 3. .The water may be triade to enter the tubes A. through 4the pipes F,and enter the boiler. after passing through` the pipe F. .The darts W indicate the direction of the water through the tubes A and tubular` caps B. In'operating our grate, itmay'be necessary to attach a pipe to one of the gratos A, audfeitt'end it upward, and into the boiler above the water line, in order to'iprevnt the stearn in thetubes freni blowing or conducting back the heated water or steam into the pump before the Water is heated in the heilen We use the same kind of material for constructing our tubular grate that is new used for similar purposes. When setting the gratos in the fire-box, care mustbe taken not to clamp them so as to prcventfexpansion; all that is required is, to

simply hold the grate in place. The bottom and top giates can ble held in'position by' means of lugs or ilangcs,

but lthe side grate should bc' supported by vcommon grooves or similar devices.

Having thus fully described our tubular gratc,'what we claim,and )desire to secure byLetters Patent of the United'StatcE, is i p The combination of tlie tubes A with the caps B, ivhcn constructed and applied substantially as and for the purpose set forth. a

' BENJ. GARVIN,`

.. It. J. PETTIBONE.

Wi tnesses t L.. W: Hanser, Omi. SWAN. 

